<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
		<style>
			.red {
				background-color: red;
			}
		</style>
</head>
<body>


<h1 class="heading">Hello jQuery</h1>
<div class="box">
	<ul>
		<li>HTML</li>
		<li>CSS</li>
		<li>JavaScript</li>
	</ul>
</div>
<button class="copy">复制</button>







<script src="js/jquery-3.5.1.js"></script>
<script src="js/index.js"></script>
</body>
</html>